Max has put together one of the best examples of how container queries will fundamentally change the way front-end development works. Better still, they provide extremely clear explanations of container queries, web components, and how they combine to unlock true intrinsic design.
Container Queries are one of the last few missing puzzle pieces in component-driven design. They enable us to give components intrinsic styles, meaning they can adapt themselves to whatever surroundings they are placed in.
I also really love the way they think about separating CSS in layout versus content; that feels like something worth co-opting now:
It’s generally a good idea in CSS to separate “layout” from “content” components and let each handle their own specific areas of responsibility. I like to think of Japanese bento boxes as a metaphor for this: a container divided into specific sections that can be filled with anything.
On how this enables reusable page-level templates, such as grid layouts:
[These] parts of the layout are only concerned with the alignment and dimensions of boxes. They have no effect whatsoever on their children other than giving them a certain amount of space to fill.